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On #1: the Gemara (Erchin 29a) states, and Rambam (Hil. Avadim 1:10) cites it as halachah, that the rules of a Jewish slave apply only when the Yovel is in effect (i.e., when most Jews live in their designated tribal territories in Eretz Yisrael, a state of affairs that hasn't existed since the end of the First Temple era and almost certainly won't exist again until Moshiach's times).

(Shem Yosef to Rambam there cites and discusses the opinion of Ritva, though, that the basic law is still in effect in the sense that a Jew sold as a slave would need a formal document of emancipation (get shichrur). However, this seems to be limited to a case where the person sells himself - Ritva writes that יכול הוא למכור עצמו לעכו"ם או לישראל - but not that beis din can do so.)